Combined air cleaner and silencer



April 13, 1943. MlERAs 2,316,527

COMBINED AIR CLEANER AND SILENCER Filed 001:. 12-, 1940 3 Sheets-Sheet lzzvmvron. BY MERRITT AMIERAS I Jan, 77

ATTORNEYS April 13, 1943. M. A. Mu-IRAs COMBINED AIR CLEANER ANDSILENCER Filed Oct. 12, 1940 3 Sheets-Sheet 2 I r E INVENTOR. MERRITTAMIERAS um fi w A TTORNEYS April 1 3 M. A. MIERAS 2,316,527

' CQIBINED AIR CLEANER AND SILENCER I Filed Oct. 12, 1940 3 Sheets-Sheet3 ATTORNEY Patented Apr. 13, 1943 2,316,527 COMBINED Am CLEANER ANDSILENCER Merritt A. Mieras, Redford Township, Wayne County, Mich.,assignor to Industrial Wire Cloth Products Company, Wayne, Mich., acorporation of Michigan Application October 12, 1340, Serial No. 361,000

3 Claims.

The present invention relates to noise silencers for internal combustionengines and particularly to silencers for the carburetor intake of suchengines.

Among the objects of the invention is to simplify the construction andadaptability of such devices.

Another object is a combined air cleaner and silencer in which thesilencer portion is of unitary construction.

Another object is an air cleaner and silencer combination that is ofmore compact construction in its vertical dimension.

Still another object is a combined air cleaner and silencer whichpermits ready removal of the air cleaner portion, for the purpose ofcleansing, without disturbing the resonator portion.

Other objects will readily occur to those skilled in the art uponreference to the following description and the accompanying drawings inwhich:

Figure 1 is a sectional view of an air cleaner and silencer on line i--lof Figure 2.

Figure 2 is a plan view of the same with a part in section.

Figure 3 is a view similar to Figure 1 but of a slightly different formof embodiment.

Figure 4 is a part plan view of the latter with a part in section.

Figure 5 is a sectional view showing still another form; and

Figure 6 is a part plan view, with a part in section, of the form shownin Figure 5.

In the drawings, in each case, the air cleaner unit is shown at the leftwith the silencer resonating chamber or chambers at the right, bothbeing mounted in a hollow frame member.

The air cleaner in each form is represented as consisting of a cuppedannulus ill in which is telescoped a second cupped annulus ii of lesserdiameter, leaving an annular air inlet space i2. Near the bottom ofmember II in its side walls are provided a suiiicient number ofopenings, indicated at i3 and by the leg i4, and above the openings,supported by a screen it is a highly porous spongy mass of filtermaterial it while the sump II in the bottom of cup I0 is adapted tocontain a body of oil.

copending application flied by the present inventor under Serial No.320,395, on February 23. 1940, now Patent No. 2,287,629, dated June 23,1942, for Air cleaner.

In the several forms of the combined device shown, the air cleaner unitis identical, except that in Figure l the lower portion of the centralair passage is formed by a tube 25 of meshed or other foraminousmaterial, the lower end of which is flared or flanged as at 26, toextend outwardly under oil sump, IT, to the bottom of which it issecured. This flanged tube 25 is spaced from the bottom wall of the aircleaner structure to leave a narrow annular passage 21,

and in the space behind the screen tube 25 and flange 26 is packed abody of non-resonant sound absorbing material such as a spongy fibrousmass of vegetable or animal origin.

In the air cleaners shown in Figure 3 et seq., instead of the screentube 25; there is used a short imperforate metal tube 30 to continuetube I! to within a short distance of the bottom plate of the cleaner,having a passage 21a.

In each of'the forms of the device the air cleaner and resonating unitare fixed in a. hollow sheet metal frame 40 made up of an upper andlower member, Al and 42 respectively, sultably flanged and fixedtogether at their edges. The upper member is provided with openings ofsuch size and shape as to receive the cleaner and resonator units andthe lower member is provided with a suitable opening and means 43 underthe air cleaner unit for mounting upon'a carburetor inlet (not shown).Member 43 also is provided with an opening of such size and shape as topermit the resonator unit to extend through to below the frame 40.

The resonator unit indicated as a whole at 50, 50a and 50b, in theseveral figures, consists, in the form of Figures 1 and 2, of acylindrical or otherwise shaped chamber 5i, within which is a secondchamber 52. These two chambers do not communicate with each other buteach communicates with the interior of the frame 40, the chamber 5ithrough a short tube 53 and the chamber 52 through a short tube 54passing through and fixed to the walls of both chambers.

In Figures 3 and 4, the resonator unit is shown as made up of chamberIla enclosing an inner chamber 52a, these being similar to chambers IIand I2 and not directly communicating. Both chambers .5la and 52a,however,. communicate with the interior of frame 40, but, in this case,the short communicating tubes 53a and Ila are concentric. the latterbeing enough smaller than tube 53a to leave a space 55 providingcommunication between chamber Ma and frame 38.

In Figures 5 and 6, the resonator 8% is shown as a single chamber Mbcommunicating with frame at through a tube 53b, which extends well intothe chamber.

In each of the several forms shown, since the relative vertical positionof the cleaner unit and resonator unit is unimportant, the verticalposition of the latter may be changed without afiecting its function.Therefore, advantage is taken of this fact to provide a more securemounting of the combined device, by securing to the bottom of theresonator unit suitable means, such as the bracket 66 and screw 6|, bywhich this portion of the device may be fixed to a suitable part of theengine.

It should be noted that the unitary construction of the resonator unitprovide for more aocurate tuning, in that "the size. shape, and numberof the chambers may easily be varied and likewise the size and length ofthe communicating passages.

Further, by constructing the device substantially as shown, the cleanerunit may be easily re-' moved for cleaning without disturbing theresonator, and the overall height of the device is materially less thanthose in common use.

Now having described the invention and the preferred embodiment thereof,it is to be understood that said invention is to be limited, not by thespecific description, but only by the scope of the claims which follow.

asi es? frame in alignment with said passage but spacedtherefrom, and aresonator unit also mounted in said frame, said hollow frame providing ameans of communication between said resonator and the said air passage.

2. The combination with an elongated hollow sheet metal frame memberhaving an air outlet passage near one end, of an air cleaner mounted insaid frame and adapted to discharge air through said outlet, and aresonating unit mount ed in the other end of said frame member, thedischarge of said cleaner being spaced from the frame member outletwithin said member and the resonator likewise opening into said framemember.

3. In combination, a hollow sheet metal frame provided with means formounting upon the intake of a carburetor, a resonator chamber mounted inone end portion of said frame, and means in another end portion of saidframe for mounting an air cleaner, said hollow frame providing a meansof communication between the resonator and the air passage of saidcleaner.

MERRITI A. MIERAS.

